The primary symptom of nystagmus is involuntary eye movement. Usually the movement is side-to-side (horizontal nystagmus), but it can also be up and down (vertical nystagmus) or circular (rotary nystagmus). The movement can vary between slow and fast, and it usually involves both eyes.
In addition to eye movement, nystagmus symptoms include sensitivity to light, dizziness, difficulty seeing in darkness, vision problems, holding the head in a turned or tilted position or feeling that the world is shaking.
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